https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85103
--- Comment #2 from Pat Haugen <pthaugen at gcc dot gnu.org> --- (In reply to Pat Haugen from comment #0) > > Very initial look at profile of bzip2 shows degradation is contained to > mainSort(), which showed a 54% increase in run cycles. Appears one of the > calls to mainGtU() is inlined into mainSort in the slow version, but the > drop in cycle counts on mainGtu is no where close to the increase on > mainSort. Appears the inlined copy of mainGtU() creates additional register pressure which results in register spill being generated in the loop of the inlined copy. The non-inlined copy of the loop is approx. 125 generated insns, whereas the inlined copy is about 215 insns (90 spill references).
